Phaeocollybia californica
Grab it firmly and pull up gently and you can confirm a Phaeocollybia by its rooting base. There are a lot of Phaeocollybia species on the west coast. Big ones - small ones, fat ones - thin ones, solitary or clustered. Phaeocollybia californica is one of the more exciting because of its attractive colouring and the fact that it often fruits in large numbers.